South Africa's FTSE/JSE Africa All Share Index dropped the most since Aug. 25, losing 542.85, or 1.7 percent, to 31,884.55 as at 2:25 p.m. in Johannesburg.

The following were among the most active stocks in the South African market today.

Anglo American Plc (AGL SJ), the diversified mining company that makes up 10 percent of South Africa's benchmark stock index, fell the most since Aug. 25, losing 12.30 rand, or 3.4 percent, to 346.70 rand. Copper fell for the second day, shedding as much as 2.2 percent to $9,367 a metric ton on the London Metal Exchange. BHP Billiton Plc (BIL SJ), the world's largest mining company, snapped two days of gains, dropping 8.07 rand, or 3 percent, to 260.13 rand.

Impala Platinum Holdings Ltd. (IMP SJ), the world's second- largest producer of the metal, declined for the second day, retreating 8.85 rand, or 3.8 percent, to 226.65 rand. Platinum dropped as much as 2.8 percent to $1,709.25 an ounce. Anglo Platinum Ltd. (AMS SJ), the world's biggest producer, lost 1.7 percent, or 11.92 rand, to 692 rand.

Sasol Ltd. (SOL SJ), the world's biggest maker of motor fuel from coal, retreated for the second day in three, weakening 9.63 rand, or 2.8 percent, to 336.31 rand. Crude oil declined as much as 1.4 percent to $88.16 a barrel, extending its biggest drop in seven weeks, on signs that snowstorms in the U.S. curbed gasoline consumption in the world's biggest crude consumer.